Created
January 22, 2014 16:22
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My Favorite Active Pattern
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| let (|Named|Array|Ptr|Param|) (t : System.Type) = | |
| if t.IsGenericType | |
| then Named(t.GetGenericTypeDefinition(), t.GetGenericArguments()) | |
| elif t.IsGenericParameter | |
| then Param(t.GenericParameterPosition) | |
| elif not t.HasElementType | |
| then Named(t, [| |]) | |
| elif t.IsArray | |
| then Array(t.GetElementType(), t.GetArrayRank()) | |
| elif t.IsByRef | |
| then Ptr(true, t.GetElementType()) | |
| elif t.IsPointer | |
| then Ptr(false, t.GetElementType()) | |
| else failwith "MSDN says this can’t happen" |
Yes check this https://github.com/palladin/LinqOptimizer/blob/gpu/LinqOptimizer.Core/ExpressionHelpers.fs
for a partial list of LINQ active patterns.
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Active patterns are also great to match .Net AST for Linq !